RESTRUCTURING - Rollforward of Restructuring Charges (Details) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($)
Restructuring Reserve [Roll Forward]
December 31, 2017	$ 2,578
Expense	553
Payments and Other Adjustments	(485)
Currency Adjustments	(73)
September 30, 2018	2,573
Severance
Restructuring Reserve [Roll Forward]
December 31, 2017	2,568
Expense	300
Payments and Other Adjustments	(248)
Currency Adjustments	(73)
September 30, 2018	2,547
Equipment moving costs
Restructuring Reserve [Roll Forward]
December 31, 2017	0
Expense	119
Payments and Other Adjustments	(93)
Currency Adjustments	0
September 30, 2018	26
Other exit costs
Restructuring Reserve [Roll Forward]
December 31, 2017	10
Expense	134
Payments and Other Adjustments	(144)
Currency Adjustments	0
September 30, 2018	$ 0

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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